Plasma-assisted CuO/CeO2/TiO2-γ-Al2O3 catalysts for NO+CH4 reaction and NO temperature programmed desorption studies

• Published in: Applied surface science Vol. 280; pp. 273 - 281
• Main Authors: Li, Huijuan, Jiang, Xiaoyuan, Zheng, Xiaoming
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2013; Elsevier
• Subjects: Activation; ALUMINUM OXIDE; Catalysis; CATALYSTS; CERIUM ALLOYS (0 TO 50 CE); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Copper; COPPER OXIDE; Cross-disciplinary physics: materials science; rheology; CRYSTAL STRUCTURE; CuO/CeO2-TiO2/γ-Al2O3; Exact sciences and technology; NO + CH4 reaction; NO-TPD; Non-thermal-plasma; Physics; PLASMAS; Reduction; Temperature programmed desorption; TITANIUM DIOXIDE; CuO/CeO2-TiO2/γ-Al2O3; Non-thermal-plasma; NO-TPD; NO+CH4 reaction; Aluminium oxide; TDS; Inorganic compounds; CuO/CeO; reaction; Catalysts; Transition element compounds; γ-Al; Rare earth compounds; Cerium oxide; O; NO + CH; TiO; Copper oxide; Titanium oxide
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.04.149

•Plasma-assisted CuO-based catalysts system with NO+CH4 reaction is studied.•CuO/CeO2/TiO2/γ-Al2O3 catalysts has the best NO removal activity among four catalysts.•NO conversion decreases in the order of CuO/CeO2/TiO2/γ-Al2O3 >CuO/TiO2/γ-Al2O3.•CuO/γ-Al2O3>CuO/TiO2.•H2-TPR and NO-TPD explain the reason for CuO/CeO2/TiO2/γ-Al2O3 better NO removal. The removal of NO and CH4 has been studied with a hybrid system integrating plasma activation and four Cu-based catalysts. The best catalytic performance was observed for catalysts obtained from CuO/CeO2/TiO2/γ-Al2O3.The efficiency of NO removal decreased with the order: 12%CuO/10%CeO2/15%TiO2/γ-Al2O3>12%CuO/15%TiO2/γ-Al2O3>12%CuO/γ-Al2O3>12% CuO/TiO2. Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD) Temperature-programmed reduction (H2-TPR) and NO temperature-programmed desorption (NO-TPD) experiments were carried out to gain insight into the synergetic effects with the catalysts. The results revealed that copper species existed as bulk CuO crystalline for all the catalysts, H2-TPR suggested that the Cu2+ incorporated TiO2 or CeO2 lattice and crystalline CuO might be the most active component for NO removal, and NO-TPD studies indicated that 12%CuO/10%CeO2/15%TiO2/γ-Al2O3 catalyst had lower NO desorption temperature and larger peak area, which seemed to be responsible for the better catalytic activity over NO+CH4 reactions than other catalysts.